/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cn.otrue.patienthealthmanager.utils;

import android.content.Context;
import android.os.PowerManager;

/**
 * Hold a wakelock that can be acquired in the AlarmReceiver and released in the
 * AlarmAlert activity
 */
public class AlarmAlertWakeLock {

	private static PowerManager.WakeLock sCpuWakeLock;

	public static void acquireCpuWakeLock(Context context) {
		if (sCpuWakeLock != null) {
			return;
		}

		PowerManager pm = (PowerManager) context
				.getSystemService(Context.POWER_SERVICE);

		sCpuWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK
				| PowerManager.ACQUIRE_CAUSES_WAKEUP
				| PowerManager.ON_AFTER_RELEASE, "AlarmClock");
		sCpuWakeLock.acquire();
	}

	public static void releaseCpuLock() {
		if (sCpuWakeLock != null) {
			sCpuWakeLock.release();
			sCpuWakeLock = null;
		}
	}
}
